TVS Hex Nuts, inch UNC/UNF – 1/4" to 1", grades 2, 5 and 8

TVS Sundram Fasteners Hex Nuts, inch UNC/UNF are hexagon nuts made by Sundram Fasteners Limited to ANSI B18.2.2 / BS 1768, in inch (UNC/UNF) sizes from 1/4" to 1", property classes 2, 5 and 8, supplied in zinc phosphate and 4 plated or coated finishes (listed below). They are the standard mating nuts for hex head bolts and screws of the same thread, made by cold forging, with hot forging for the larger sizes, and carry the TVS mark on the face.

SFL's retail price list of October 2026 gives recommended retail list prices from Rs 225 to Rs 5,880 per 100 pieces across the listed sizes; the exact price for your sizes, pitch, property class and finish is confirmed on enquiry.

Jai Enterprises is an authorised distributor of TVS Sundram Fasteners high tensile fasteners and supplies them from Bhilai and Raipur all over Chhattisgarh - Bhilai, Raipur, Durg, Korba, Bilaspur, Raigarh, Jagdalpur, Kanker, Ambikapur and every other district - and across India.

Is this the right one for you?

Check these four things before you order:

• Your thread is inch UNC or UNF (American unified), not BSW/BSF.
• The size you need is within 1/4" to 1".
• You need a plain hex nut in grade 2, 5 or 8 (SAE J995); pair grade 5 nuts with grade 5 bolts and grade 8 nuts with grade 8 bolts.
• Vibration is not the main concern - otherwise look at the SunLoc nylon insert nuts or the prevailing torque nuts.

List prices (SFL, 1 October 2026)

Prices are SFL's recommended retail list prices effective 1 October 2026, in rupees per 100 pieces, for the phosphated finish. A few sizes are shown; ask us for any other size in the range.

• 1/4" (GR 5): Rs 225 per 100 pieces
• 5/16" UNC: Rs 235 (GR 5) / Rs 275 (GR 8) per 100 pieces
• 3/8" UNC: Rs 340 (GR 5) / Rs 415 (GR 8) per 100 pieces
• 1/2" UNC: Rs 820 (GR 5) / Rs 990 (GR 8) per 100 pieces
• 5/8" UNC: Rs 1,730 (GR 5) / Rs 1,835 (GR 8) per 100 pieces
• 5/8" UNF: Rs 1,730 (GR 5) / Rs 1,835 (GR 8) per 100 pieces
• Phosphated finish; GR 5 and GR 8 listed (ANSI B18.2.2 / BS 1083, SAE J995)

At a glance

• Brand: TVS Sundram Fasteners (Sundram Fasteners Limited, TVS group)
• Product: Hex Nuts, inch UNC/UNF
• Standard: ANSI B18.2.2 / BS 1768
• Sizes: 1/4" to 1"
• Form: hexagon
• Property class: 2, 5 and 8
• Material: Steel
• Surface finish: zinc phosphate, trivalent iridescent, trivalent white, hot dip galvanised and zinc flake coating (Geomet / Magni / Delta)
• Forging: cold forging, with hot forging for the larger sizes
• List price: Rs 225 - 5,880 per 100 pieces (SFL list, 1 October 2026); exact price on enquiry
• Supplied by: Jai Enterprises, Bhilai and Raipur - to every district of Chhattisgarh and across India, +91 9340081159

Specifications and dimensions

• Standard: ANSI B18.2.2 / BS 1768
• Material: high tensile steel; inch nut grades to SAE J995 (2, 5, 8)
• Property class: 2, 5 and 8
• Surface finish options: zinc phosphate, trivalent iridescent, trivalent white, hot dip galvanised and zinc flake coating (Geomet / Magni / Delta)
• Manufacture: cold forging, with hot forging for the larger sizes
• Marking: TVS brand mark on the face and the property class mark
• 1/4": 20 UNC / 28 UNF tpi; across flats 11.12 mm, across corners 12.40 mm, thickness 5.74 mm
• 5/16": 18 UNC / 24 UNF tpi; across flats 12.70 mm, across corners 14.15 mm, thickness 6.93 mm
• 3/8": 16 UNC / 24 UNF tpi; across flats 14.27 mm, across corners 15.96 mm, thickness 8.55 mm
• 7/16": 14 UNC / 20 UNF tpi; across flats 15.87 mm, across corners 17.73 mm, thickness 9.77 mm
• 1/2": 13 UNC / 20 UNF tpi; across flats 19.05 mm, across corners 21.34 mm, thickness 11.37 mm
• 5/8": 11 UNC / 18 UNF tpi; across flats 23.82 mm, across corners 26.70 mm, thickness 14.19 mm
• 3/4": 10 UNC / 16 UNF tpi; across flats 28.57 mm, across corners 31.85 mm, thickness 16.89 mm
• 7/8": 9 UNC / 14 UNF tpi; across flats 33.32 mm, across corners 37.22 mm, thickness 19.30 mm
• 1": 8 UNC / 12 UNF tpi; across flats 38.10 mm, across corners 42.55 mm, thickness 22.53 mm
• Note: 7/16": the printed figures (15.87 mm across flats, 17.73 mm across corners) are the 7/16" bolt-head sizes; an ANSI B18.2.2 hex nut is 11/16" (17.46 mm) across flats - confirm with us when ordering
• Source: SFL's technical product catalogue (September 2026 edition) and SFL's digital product catalogue; dimensions in mm

Why choose TVS Sundram Fasteners

• Made by Sundram Fasteners Limited, a TVS group company making high tensile fasteners since 1966: first Indian company with ISO 9000, IATF 16949:2016 certified, Deming Prize 2018 for 17 plants.
• Every lot is backed by a BIS, NABL and ISO/IEC 17025 certified laboratory - tensile, fatigue, torque-tension, salt spray and coating thickness testing - as described in SFL's technical product catalogue (September 2026 edition).
• Made to a named standard - ANSI B18.2.2 / BS 1768 - with the dimensions published in SFL's technical catalogue, so parts interchange with any other maker's to the same standard.
• The grade mark on each part shows its property class (2, 5 and 8), so site inspection is simple.
• A choice of finishes - zinc phosphate, trivalent iridescent, trivalent white, hot dip galvanised and zinc flake coating (Geomet / Magni / Delta) - from plain indoor use to hot dip galvanised and zinc flake coating for outdoor and corrosive service.
• Available through Jai Enterprises in Bhilai and Raipur, with the full size range to order.

How to choose and fit

1. Match the thread of the bolt exactly - size and pitch (or threads per inch) - from the table above.
2. Match the grade of the nut to the bolt (nut grade not lower than the bolt grade).
3. Fit a washer under the nut where the joint face is soft, slotted or painted.
4. Tighten to the specified torque with the bolt held.

Where it is used

• every hex bolt and screw joint of the same thread
• structural steel and fabricated frames
• automotive and tractor assemblies
• maintenance and repair stock
• imported machinery and older plant built to inch standards

Other versions and series

• TVS Sundram Fasteners Hex Nuts, ISO 4032 metric - M4 to M64, list price Rs 180 - 190,360 per 100
• TVS Sundram Fasteners Hex Nuts, DIN 934 - M10, M12, M14 and M22, list price Rs 335 - 4,325 per 100
• TVS Sundram Fasteners Hex Nuts, inch BSW/BSF - 1/4" to 3/4", price on request

Related products

• TVS Sundram Fasteners Hex Head Cap Screws, inch UNC/UNF - the matching hex head cap screw
• TVS Sundram Fasteners Hex Head Bolts, inch UNC/UNF - the matching hex head bolt
• TVS Sundram Fasteners SunLoc Nylon Insert Nuts, inch UNC/UNF - the locking version with a nylon insert

Frequently asked questions

What is the price of Hex Nuts, inch UNC/UNF?

SFL's recommended retail list price effective 1 October 2026 runs from Rs 225 to Rs 5,880 per 100 pieces across the listed sizes, for the phosphated finish. The examples above show typical sizes. Call Jai Enterprises on +91 9340081159 with your sizes, grade, finish and quantity for the exact price; other finishes and sizes outside the list are quoted on enquiry.

Which nut class goes with which bolt?

Use a nut of at least the bolt grade: grade 5 nuts (SAE J995) with grade 5 bolts and grade 8 nuts with grade 8 bolts. A weaker nut can strip before the bolt reaches its load.

Are TVS Hex Nuts, inch UNC/UNF available in Chhattisgarh?

Yes. Jai Enterprises, an authorised distributor of TVS Sundram Fasteners, supplies from Bhilai and Raipur all over Chhattisgarh and across India. Call +91 9340081159 or use the enquiry form.

Can I get a different finish or a non-listed size?

Yes. The standard finishes are zinc phosphate, trivalent iridescent, trivalent white, hot dip galvanised and zinc flake coating (Geomet / Magni / Delta); other finishes and sizes or lengths outside the list are quoted on enquiry from SFL.

How to order

Call Jai Enterprises on +91 9340081159 or send an enquiry with the sizes, pitch, property class, finish and quantity of Hex Nuts, inch UNC/UNF you need. SFL's list price is Rs 225 - 5,880 per 100 pieces across the listed sizes (SFL list, 1 October 2026); the exact price is confirmed on enquiry. We supply from Bhilai and Raipur all over Chhattisgarh - Bhilai, Raipur, Durg, Korba, Bilaspur, Raigarh, Jagdalpur, Kanker, Ambikapur and every other district - and across India.